Along with the development of science and technology , microwaves are widely used in various fields .Though they have brought much convenience to people , their potential adverse health effects are becoming a concern of governments and researchers .High power microwaves ( HPMs) are widely used in high-tech and new concept weapons , increasing the chance that troops are exposed to HPM environments .It has been clearly confirmed that microwave radiation could cause varying degrees of damage to the nervous system , immune system , cardiovascular system and reproductive system under specific conditions .Therefore , it is of important significance to reduce adverse effects of HPM radiation and improve the combat capability of troops via effective medical protection while doing well in physical protection .According to the mecha-nism and characteristics of microwave radiation damage effects , recent advances in microwave radiation protection are re-viewed in this article , hoping to facilitate research on safer and better drugs .

Objective To investigate the expression and significance of programmed death-1 (PD-1) in cellular immune response of patients with tuberculosis (TB) infection .Methods Twenty drug-sensitive (DS) and fifteen drug-resistant (DR ) subjects with TB infection who were hospitalized in Jiangmen Central Hospital affiliated Sun Yat-Sen University and Jiangmen tuberculosis dispensary from July 2011 to July 2012 were included in this study . Twenty-six healthy subjects were included as control . The expressions of PD-1 on CD4 + and CD8 + T lymphocytes were measured using flow cytometry and plasma interferon-γ (IFN-γ) ,levels were analyzed before and after TB treatment for 3 months .Kruskal-Wallis H test was used for analysis of multiple independent samples and Wilcoxon signed-rank test was used for analysis of paired samples . Pearson test was used for correlation analysis . Results After anti-TB chemotherapy ,the expressions of PD-1 on CD4 + and CD8 + T cells in both TB groups were significantly decreased (DS group :15 .99% vs 21 .59% and 11 .86% vs 18 .52% ;DR group :26 .64% vs 35 .47% and 29 .64% vs 34 .56% ) (both P < 0 .05) .Plasma IFN-γ level in DS group increased significantly after treatment(50 .65 ng/L vs 32 .31 ng/L , P < 0 .01) ,while that in DR group did not increase significantly (22 .26 ng/L vs 20 .03 ng/L ,P> 0 .05) .In DS group ,the expression of PD-1 on CD4 + T lymphocytes was negative correlated with plasma IFN-γ level both before and after anti-TB chemotherapy (pre-treatment : r = - 0 .510 , P < 0 .05 ; post-treatment : r = - 0 .520 , P< 0 .05 ) . Conclusions PD-1 modulates T cell function of immune response against TB infection in DS-TB subjects and plays a key regulatory role in CD4 + T lymphocyte mediated immunity during TB infection . However , the immunomodulatory mechanism of cell immunity in DR-TB subjects may be more complex .

Objective To explore the protective effects of a new military functional food NB-5 on psychological stress-induced oxidative stress .Methods Rat whiskers were completely removed to induce the oxidative stress , and the concen-trations of MDA and protein carbonyl in various organs were detected to study the damage to membrane lipid and protein . Rats were fed with NB-5 for 4 weeks, and the oxidative stress was induced by whisker cutting .Biochemical marks men-tioned above were detected to explore the protective effects of NB-5.Results and Conclusion Lipid and protein peroxida-tion occurred in the brain , heart, liver, spleen and kidney after whisker removal due to emotional stress , while the catalase ( CAT) activity decreased significantly in these organs except the spleen .In this experiment model , NB-5 showed a good free radical scavenging activity to reduce the lipid and protein peroxidation among whisker -cutting rats fed with NB-5 in ad-vance.So NB-5 can serve as a good food for soldiers in case of emergency incidents .

Objective To investigate the adverse effect of different doses of high power microwave(HPM) irradiation on oxidative stress in the brain of Wistar rats in order to contribute to establishing an animal model to evaluate protective agents which will be used for protection against microwave radiation.Methods Eighty male Wistar rats were randomly divided into 16 groups according to factor analysis.The average power density was 0,10,30 and 100 mW/cm2 and the sampling time was 6 h,1,3 and 7 d .The duration of exposure was 6 minutes for each radiation group.After exposure, the rats were sacrificed at each sampling time.Colorimetric method was used to measure the content of malondialdehyde(MDA) and protein carbonyl, the activity of GSH-px, SOD and CAT.Results The content of MDA and protein carbonyl of each radiation group was increased with the radiation dose, but decreased with the sampling time prolonged.The activity of superoxide dismutast(SOD),glutathion peroxidase(GSH-px) and catalase(CAT) in each radiation group was decreased with the radiation dose increased, and with the sampling time prolonged, but increased later.Conclusion Microwave radiation can cause oxidative stress in rats brain, as shown by the oxidative damage of lipid and protein and the decrease in the activity of antioxidant enzymes.Besides, the effect also depends on the radiation dose and sampling time.

Objective:This study aimed to evaluate the performance of breast magnetic resonance imaging (MRI) abbreviated protocol (AP) in diagnosing breast neoplasms.Methods:We retrospectively analyzed the data of 86 patients who had undergone breast MRI examinations and compared the images using an AP and full diagnostic protocol (FDP). The AP consisted of axial T2-weighted imaging (T2WI), diffusion-weighted imaging (DWI), and four-phase dynamic enhancement sequences. The FDP consisted of sagittal T2WI, axial T2WI, T1-weighted imaging, DWI, and seven-phase dynamic enhancement sequences. All the images were analyzed using the Breast Imaging Reporting and Data System (BI-RADS). The consistencies between the different protocols were then calculated. With the pathological diagnosis as the gold standard, the diagnostic capabilities of the two protocols were compared.Result:Two radiologists analyzed the AP and FDP images. The consistencies in the BI-RADS between the different protocols were 0.856 and 0.900, and those in time-signal intensity curves (TICs) were 0.822 and 0.922. Within the same protocol, the consistencies in the BI-RADS between different radiologists were 0.744 and 0.822, and those in TICs were 0.889 and 0.878. No significant differences were found ( P>0.05). In terms of diagnosing malignant neoplasms using the BI-RADS, the sensitivities of the AP and FDP were 89.8% (95 %CI: 0.785-0.958) and 91.5% (95 %CI: 0.806-0.968), respectively; their specificities were 71.0% (95 %CI: 0.518-0.851) and 77.4% (95 %CI: 0.585-0.897), respectively; and the areas under the curves (AUCs) were 0.804 (95 %CI: 0.698-0.910) and 0.845 (95 %CI: 0.748-0.941), respectively. Diagnosing malignant neoplasms using TICs, the sensitivities of the AP and FDP were 86.4% (95 %CI: 0.745-0.936) and 89.8% (95 %CI: 0.785-0.958), respectively; their specificities were 61.3% (95 %CI: 0.423-0.776) and 67.7% (95 %CI: 0.485-0.827), respectively, and the AUCs were 0.739 (95 %CI: 0.623-0.855) and 0.788 (95 %CI: 0.679-0.897), respectively. There was no significant difference between the AP and FDP ( P>0.05). The MRI acquisition times of the AP and FDP were 11.97±0.94 min and 21.25±1.12 min, respectively, with a significant difference ( P<0.001). The average reading time was reduced by 13.5% using the AP compared with that using the FDP. Conclusion:Compared with the FDP, the AP reduced the acquisition time and maintained the diagnostic accuracy, which can be used as an improved pattern for MRI screening in high-risk populations of breast neoplasms.

Objective To investigate the differences in magnetic resonance imaging characteristics between perianal?fistulas of Crohn disease (P?FCD) and perianal?fistulas of non?Crohn disease (P?FNCD). Methods A retrospective analysis was made of 109 patients with perianal fistula who were confirmed by clinical examinations and surgery and had complete preoperative pelvic MRI data from sir run run shaw hospital affiliated to Zhejiang University from June 2015 to March 2017. Patients were divided into P?FCD and P?FNCD groups according to whether the patient was clinically diagnosed with Crohn disease (CD). There were 59 cases in group P?FCD and 50 cases in group P?FNCD. All patients underwent pelvic MRI plain scan and enhanced scan. the classifications of perianal fistula (St. James University Hospital classification and improved Parks classification) were evaluated. The number of branches, the number of abscesses, the number of internal opening, the height of the internal opening were measured and recorded. The incidence of proctitis and anal inflammation were recorded. Van Assche score was evaluated. Measured data between patients in the P?FCD and P?FNCD groups were compared using independent sample t test (normal distribution) or non?parametric test (skewed distribution).The quantitative data were compared using cross?sectional Pearson χ2 test. Results There were significant differences in the number of branches, the number of abscesses, the number of internal opening, the height of the internal opening, the positive rate of proctitis, the positive rate of anal canalitis, and the Van Assche score between the P?FCD group and the P?FNCD group (all P<0.05). There was no significant difference in the modified Parks classification between the P?FCD group and the P?FNCD group (P>0.05).There was significant difference in the classification of St. James University Hospital between the P?FCD group and the P?FNCD group (P<0.05). Conclusions P?FCD is mainly composed of high complex anal fistula, which is significantly different from P?FNCD. We used St. James University Hospital classification and Van Assche score to diagnose perianal fistula in combination with clinical examinations, which was helpful for the diagnosis of P?FCD.